Monorail motor truck



12, 1935. BE CLERMONT DUNLAP MONORAIL MOTOR TRUGK Filed March 14, 1934 5Sheet s-Sheet 2 .Ziym hfaw J70 fiprmmf w/a a:

Nov, 12, 1935.

DE CLERMONT DUNLAP MONORAIL MOTOR TRUCK Filed March 14, 1934 5Sheets-Sheei 5 n an no 6 N 1935, DE cLERM N r DUNLAP 2,020,549

MONORAIL MOTOR TRUCK Filed March 14, 1954 5 Sheets-Sheet 4 ww a 1 DECLERMONT DUNLAP MONORAIL MOTOR TRUCK Nov. 12, 1935.

Filed March 14, 1934 5 Sheets- Sheet '5 L E f 'L 15202 far J6('iermoivfJairZa Patented Nov. 12, 1935 UNITED STATES PATENT OFFICE.

15 Claims.

The present invention particularly pertains. to

- the running gear of a monorail transportation system and especiallyrelates to a wheeled truck adapted to traverse a single rail track, andto the means for supporting a suspended car from the truck, whereby thecar is disposed in a dependent position beneath a monorail track and thetruck maintained on the track primarily by stable equilibrium.

An object of the invention is to provide a monorail truck having a longwheel base whereby the weight of a depending coach or car will bedistributed over a considerable length of the monorail, and a particularobject is to provide an articulate construction of the truck and itsconnection to the suspended car whereby the running gear Will have suchflexibility as to permit it to readily traverse comparatively shortcurves and varying inclinations of the track, and also travel over smalluneven places in the track without excessive jar being imparted to thecar.

Another object is to provide a monorail truck embodying a main truckframe on which a depen-ding car is carried, and including a pair ofwheeled truck frames adapted to traverse a single rail track and onwhich the main truck frame is supported, in which means are providedwhereby both vertical and horizontal pivotal movement may be had betweenthe main truck frame and the wheeled truck frames, and also between themain truck frame and its connection with the depending car.

Another object is to provide a running gear for a monorailtransportation system which is adapted to support depending coaches ofconsiderable length and in which the parts are so constructed andarranged as to permit their ready adaptation to both curves andinclinations in a monorail track being traversed thereby.

Another object is to provide an articulate joint for use between themain truck frame and the wheeled truck frame, and the main truck frameand a depending car-supporting hanger, which will afford a substantialbearing for the loads imposed thereon and yet admit of ready pivotalmovement of the joint on a vertical plane in one direction.

Another object is to provide a monorail truck embodying a plurality ofaligned wheels in which each of the wheels may be propelled from a motorcarried on the truck, and which is so constructed as to permit readyassemblage of the parts.

A further object is to provide a monorail truck embodying a series ofwheels adapted totraverse a single-rail track in which the wheels are sospaced and connected to each other, and the connection with thedepending load carried by the truck so arranged as to effect asubstantially equal distribution of the weight of the load to the trackthroughout the several wheels of the truck. 5

With the foregoing objects in view together with such other objects andadvantages as may subsequently appear, the invention resides in theparts, and in the construction, combination and arrangement of partshereinafter described and 10 claimed, and illustrated by way of examplein the accompanying drawings, in which:

Figure 1 is a view in side elevation of a monorail coach and itssupporting trucks showing the invention as applied; 15

Figure 2 is a view of a coach supporting truck as seen in sideelevation, with portions broken away showing parts thereof in section;

Figure 3 is a detail in vertical section taken on the line 33 of Figure2, showing the articulate 20 connection between the main truck frame anda wheeled truck on which the main frame is carried;

Figure 4 is a horizontal section and plan view taken on the line 4-4 ofFigure 3; 25 Figure 5 is a detail in section as seen on the line 5Ei ofFigure 3;

Figure 6 is an inverted planview as seen in the direction indicated bythe arrows 6 in Figure 3; 30

Figure '7 is a plan view of a portion of the truck as seen on the line'l-! of Figure 2;

Figure 8 is an end view of the truck as seen in the direction indicatedby the arrow 8 in Figure 7; 35

Figure 9 is a detail in vertical section as seen on the line 99 ofFigure 1 showing the manner of suspending the car on the main truckframe;

Figure 10 is a View in section and elevation taken on the line lt-ID ofFigure '7 showing the 40 manner of equipping the truck with a brake;

Figure 11 is a view of the truck as seen in horizontal section on theline ll-Il of Figure 2,-

with parts shown in plan;

Figure 12 is a detail in section as seen on the 45 line l2-2 of Figure13;

Figure '13 is a view in section and elevation as seen on the line l3|3of Figure 11;

Figure 14 is a detail in section as seenon the 60 line Hil4 of Figure 9showing the articulate joint and bearing employed in connecting thesuspended car to the main truck frame;

Figure 15 is an inverted plan view of the structure shown in Figure 14;

Figure 16 is a view in section and inverted plan as seen on the line|6|6 of Figure 14.

Figure 17 is a view in vertical section illustrating a modified form ofthe articulate joint and bearing shown in Figure 14;

Figure 18 is an inverted plan view of the structure shown in Figure 1'7;

Figure 19 is a view in cross section as seen on the line |9|9 of Figure18;

Figure 20 is a diagrammatic view in side elevation illustrating themanner of carrying the suspended car from a pair of trucks, and showingin dotted lines the relative movement of the trucks in traversing aninclined rail;

Figure 21 is a diagram in side elevation of cne of the trucks showingthe manner in which vertical articulation between the main truck frameand the wheeled truck frame is effected; and

Figure 22 is a plan view illustrating the manner in which the Wheeledtruck frame, main truck frame, and coach suspension, articulatehorizontally relatively to each other on traversing a curve. I

Referring to the drawings more specifically, A and B indicate a pair oflongitudinally spaced monorail trucks, C designates a monorail track onwhich the trucks are adapted to travel, and D designates a coach or carwhich is suspended from the trucks A and B by means of bent hangers Ewhereby the coach is supported in a dependent position from the trucksand disposed beneath the track C. Each of the trucks A and B embodies amain truck frame F and a pair of complementary wheeled truck frames Gwhich are disposed in tandem relation to each other and are connectedtogether by means of the main truck frame F on which latter the hanger Eis supported. Each of the truck frames G embodies a pair of side framescomprising a top rail 25 and a bottom rail 25 suitably connectedtogether; the side frames being connected together by end rails 27 and28 extending in continuation of the rails 25 and 26.

Each of the truck frames G is fitted with a pair of aligned tractionwheels 35 adapted to traverse the monorail track C; the wheels 33 beinghere shown as formed. with side flanges a and b to extend on oppositesides of the rail C to retain the wheels in place on the rail whiletraversing same. The wheels 35 are fixed on driven shafts 3| carried injournal boxes 33 mounted for vertical movement in suitable guideways 35carried on the truck framed side members.

Carried on the lower rail 26 of the side frame intermediate the endsthereof is a platform 31 on which is mounted a motor J which embodies adrive shaft 33 having its ends projecting from opposite sides of themotor and on each end of which is mounted a spur pinion 353 which isgeared to a toothed wheel 40 on each of the shafts 3| through a pair ofinter-meshing idler gears 4| and 42, whereby on operation of the motor Jeach of the wheels 29 will be driven through the train of gears 39, 4|,42 and 4B. The idler gears 4| and 42 are revolubly mounted on shafts '43and 44 carried on a pair of links 45 and 46 which extend on oppositesides of the pinion 39 and toothed wheel 40 and are carried on theshafts 38 and 3|. The guide-ways 35 carrying the journal boxes 33 areslightly curved on an arc concentric with the center of the motordrive-shaft 38 to permit oscillation of the links in event of verticalmovement of the shafts 3| and their journal boxes 33 relative to thetruck frame.

Interposed between the journal boxes 33 and the upper end walls of theguide-ways 35 are helical springs 41 which serve to yieldably transmitthe load carried. on the truck frame to the wheeled trucks, and act toyieldably oppose and cushion vertical movement of the wheels relative tothe truck frame. It is evident that by the construction just describedthe truck Wheels 35 on each of the wheeled truck frames G are adapted tohave independent vertical movement relative to the truck frames, which,with the cushion action of the springs 4'! serve to permit the travel ofthe truck over small uneven places in the trackwithout excessive jarbeing imparted to the car suspended from the truck.

The main truck frame F embodies a pair of spaced side rails 39 and 58which are connected together at their ends by beams 5| which extend overtransverse beams 52 carried on the upper side rails of the truck framesG; the end beams 5| of the main truck frame being pivotally supported onthe wheeled truck frames G at the 25 point of intersection of planesextending through the longitudinal and transverse centers of the wheeledtrucks, which point is located approximately midway between the wheels35 whereby the load imposed on the main truck frame will be borneequally by each of the truck wheels on each of the wheeled trucks.

The connection of the end beams 5| of the main truck frame to thewheeled truck frames constitutes an important feature of the presentinvention and comprises a construction whereby the main truck frame willbe supported in a seated position on the wheeled truck frames in suchmanner that the Wheeled truck frames may have both vertical andhorizontal pivotal movement relative to the main truck frame, andwhereby each of the wheeled truck frames may have their respectivemovement independent of each other, thus giving the truck a desiredflexibility, whereby it may readily traverse short curves and varyinginclinations of the track C. This connection is particularly shown inFigures 3, 4, 5 and 6 and comprises a block 53 carried by the transversebeam 52 which block is formed with a socket 54 having a curvature whichwill conform to a portion of a sphere, and which socket forms a seat fora substantially semi-spherical bearing member 55 projecting from theunder side of the beam 5| and which bearing member is adapted to rotatehorizontally in the socket 5-3 and also 55 to rock therein.

The beam 5| carries a downwardly projecting king pin 55 which is in theform of a headed bolt and extends downwardly through an opening formedin the beam 5| to receive it with the head thereof seating on the upperface of the beam 5|. The pin 56 projects axially through thesemispherical bearing member 55 and has its lower end portion projectingthrough a slot 5'! in the block 53 which slot is elongated in thedirection of the length of the wheeled truck frame to permit the latterto rock vertically on a plane extending longitudinally through thecenter thereof; the side walls of the slot 51, however, slidablycontacting the lower end portion of the king pin to hold the wheeledtruck frame against lateral rocking movement relatively to the maintruck frame. Vertical rocking movement of the bearing member 55 andsocket 54 relatively to each other is thus confined to one direction,but horizontal turning movement of the bearing member in the socket isunlimited. The lower end of the king pin 56 projects beyond the underside of the block 53 and has a nut 58 screwed thereon which nut bearsagainst a washer 59 arranged to span the lower end of the slot 51 and tobear on the under side of the block 53. The lower face of the block 53is curved as indicated at 6|, being formed on an arc of a circleconcentric with the center of the spherical bearing member 55; thearcuate face 65 being curved in the direction of the length of theelongated slot ii'l, as shown in Figures 3 and 6, so as to form abearing for the washer 55 on the under side of the block 53 throughoutthe range of movement of the block 53 relatively to the lowerend portionof the king pin 56.

As a means for relieving the king pin 56 of lateral bending strains, theupper face of the block 53 is formed with a pair of upwardly extendingtapered projections 62 arranged on opposite sides of the bearing member55 contiguous thereto, the peaks 63 of which projections slidably abutagainst the under side of the beam 5! at points on a plane extendingdiametrically through the king pin 5%, which projections, whilepermitting longitudinal vertical rocking movement of the wheeled truckframe relatively to the main truck frame, will serve to inhibit lateralrocking movement of the wheeled truck frame relatively to the main truckframe.

The hangers E are connected to and supported on the main truck frame Fthrough the medium of a vertically oscillatory and horizontallyrevoluble bearing member, which may be constructed either as shown inFigures 14 to 16 or in Figures 17 to 19, and which bearing membercorresponds in effect to the bearings between the main truck frame andthe wheeled truck frames as just described. The bearing member shown inFigures 14 to 16 embodies a semi-spherical body 55 seated in a socket(it on a block 6?, and a king pin 68 passed through an opening 69 in abracket it formed on the upper end of the hanger E, the lower portion ofwhich pin passes through an elongated slot ii in the bottom wall of thesocket 6 5 and is held in place by a nut M. The block 6i is supported ondownwardly extending brackets 73 on the main truck frame, and is sopositioned on the latter that the vertical axis of the bearing will bedisposed in alignment with the axes of the bearings between the maintruck frame and the wheeled truck frames, which axes are normallydisposed on a vertical plane extending through the longitudinal centerof the rail 0.

The center of vertical oscillation of the bearing is located on ahorizontal plane below the centers of oscillations of the bearingsbetween the main truck frame and the wheeled truck frames, being hereshown as disposed substantially on a plane extending horizontallythrough the axis of the truck wheels, it being desirable to dispose thepoint of connection between the hanger of the main truck framecomparatively close to the rail C, since the closer the depending loadcarried by the truck is to the plane of the bearing surface of thewheels of the latter, the greater the stability obtained. The slot Hextends in the direction of the length of the truck so as to limitoscillatory movement of the hanger E and the main truck frame F relativeto each other in one direction, and to inhibit oscillation of the hangerE in a direction transversely of the truck so that on lateral swingingof the car D, as in traversing curves, the truck will rock laterallywith the swinging movement of the car. The underside of the bracket Illis formed with a pair of tapered projections 14 arranged on oppositesides of the bearing member 85 the apices 15 of which slidably contactthe upper face of the block 67 at points 5 on a plane extending throughthe longitudinal center of the bearing member 65, and in line with thecenter of oscillation of the bearing member. These projections serve asstops, as do the side walls of the slot H, to confine verticaloscillation 10 of the hanger E and the frame F relatively to each otherto a direction of the length of the car D. In the form of the hangerbearing shown in Figures 17 to 19 a pair of pins 16 and ii are employedin effecting connection between the 15 semi-spherical bearing member 18and its supporting block 19 which construction is employed where thebearing is of such dimensions that a single king pin would beimpractical. The pair of pins 16 and 1'! extend through the bracket 1E]20 i of the hanger, and are carried through the semispherical bearingmember 18 on opposite sides to the center thereof, and are continuedthrough a pair of arcuate slots and 8! formed in the block 19; the slots8'3 and being formed of 25 such contour as to permit rotation ofthehearing l8 relatively to the block l9 a limited distance and also permitlateral rocking movement of the bracket in a limited distance in thedirection of the length of the suspended car. and ll are here shown asbeing in the form of bolts the heads 82 and B3 of which bear on theupper face of the hanger bracket i3, and the lower ends of which havenuts 84 and 85 screwed thereon which bear against washers 86 and 81 35 7slidably seating on an arcuate face 88 formed on the under side of theblock 19. The tapered projections M on the underside of the hangerbracket are disposed so that the apices i5 thereof extend on a planepassing through the centers of 40 the pair of pins 16 and l! asindicated in dotted lines in Figures 18 and 19.

The hanger E is thus suspended from the main truck frame F at a pointbetween the: wheeled truck frames G intermediate the articulate con- 45nections between the ends of the main truck frame and the pairs ofwheeled truck frames so that the load suspended by the hangers will beimposed on the truck centrally thereof.

It will be seen from the foregoing that the 50 main truck frame F andthe depending hanger E may have vertical oscillatory movement relativeto each other on planes extending longitudinally thereof, but are heldagainst transverse movement in relation to each other while at the 55same time they may have horizontal pivotal movement relative to eachother, which, with the affording of corresponding movements between themain truck frame and the wheeled truck frame gives the truck greatflexibility so 60 that a truck of comparatively long wheel base mayreadily traverse curves of short radius, and also travel over varyinginclinations in the track without imparting excessive jar or shock tothe suspended car. 65 As a means for effecting a braking action toretard or stop movement of the truck each of the shafts SI on which thewheels 39 are mounted is fitted with a brake drum 90 and arranged onopposite sides thereof is a pair of brake shoes 70 9! and 92 pivotallymounted at 93 and 534 on upstanding links 95 and 95 pivoted at 91 and 98at their lower ends to a beam 99 carried by the V wheeled truck frame.The upper ends of the links 95 and 96 pivotally connect with links we75- The pins 16 30 and IM which extend inwardly and connect with across-arm I02 pivoted at I03 on a depending bracket I04 carried by thetruck frame, and which cross-arm is connected by a link I05 to the outerend of a piston rod I06 extending into a cylinder I01 and fitted with apiston I08 within the latter. A spring I09 arranged within the cylinderI01 bears against the piston I 68 and normally maintains the latter in aretracted position in which the brake shoes 9| and 92 will be disposedout of operative engagement with the brake drum 90. The brakes areapplied by directing fluid pressure into the cylinder I01 in front ofthe piston I08 through a port II 0 in a usual manner, whereby the pistonI08 will be caused to move in opposition to the spring I07 therebyrocking the cross-arm I02 in such direction as to exert a pull on theupper ends of the links and 08 and thereby advance the brake shoes 9!and 92 into frictional engagement with the brake drum 90.

The hanger E may be of any suitable construction and may be applied tothe car D in any suitable manner but is essentially of substantially ofthe form shown in Figure 9, that is, with a vertically extending bodyportion I I I from the upper end of which projects the horizontallyextending bracket I0, before referred to, and from the lower end ofwhich projects in alignment with the bracket Ill, a horizontal bracketII 2 connected to the roof structure I I3 of the car D through aconnection indicated generally at I I l. The connection may be of anysuitable construction, but is essentially located directly beneath thepivotal support of the hanger E on the truck frame F.

In the application of the invention the car or coach D is preferablysuspended from a pair of the trucks as shown in Figure l, but by reasonof the several vertical oscillatory and horizontally pivotal connectionsprovided in the truck, the number of trucks employed may be increased.

The operation of the invention will be readily understood on referringto Figures 20, 21 and 22; Figure 20 illustrating in dotted lines themanner in which relative vertical oscillatory movement of the hanger Eand main truck frame F will be effected when one of the trucks fromwhich the car is suspended is positioned on a length of track that isinclined relative to the portion of the track on which the other truckis supported; Figure 21, illustrating in dotted lines the manner inwhich the wheeled truck frames G and the main truck frame F may havevertical rocking movement relative to each other as one of the wheeledtrucks is positioned on a length of track disposed at an angle to alength of track on which the other wheeled truck is supported; andFigure 22 illustrating the manner in which the hangers E, main truckframe F, and the wheeled truck frames G may swing horizontallyrelatively to each other when the trucks are traversing a curved track.

In effecting propulsion of the truck electrical current is directed tothe motors J to operate the latter whereby the shafts 3i carryingthetraction wheels 30 will then be driven through the gear connectionbetween the shafts 3I and the motor drive shaft 38 as before described.

It will be apparent that by the use of this invention, cars ofconsiderable length may be adequately supported and operated on anoverhead monorail track.

While I have shown and described a specific embodiment of my invention Ido not limit myself to the exact details of construction and arits ends;said wheeled truck frames and hanger adapted to have vertical articulatemovement relative to the main truck frame, and also adapted to havehorizontal pivotal movement relative 15 to the main truck frame.

2. A monorail truck comprising a main truck frame, a pair of wheeledtruck frames supporting the end portions of the main truck frame, a benthanger suspended from the main truck frame 20 at a point between thewheeled truck frames for supporting a load suspended below the truck,there being a connection between each of the wheeled trucks and the maintruck frame and between the hanger and the main truck frame 5 which willpermit both relative vertically oscillatory movement and horizontalpivotal movement between the main truck frame and the wheeled truckframes and between the main truck frame and the hanger. 30

3. In a monorail truck, a main truck frame, a pair of wheeled truckssupporting said main truck frame and connected to the end portions ofthe latter, a pair of aligned wheels on each of said wheeled truckframes adapted to traverse a single 35 rail track, a connection betweeneach of the wheeled trucks and the main truck frame adapted to permitboth vertically oscillatory movement and horizontal pivotal movement ofthe wheeled truck frames relative to the main truck frame, a 4 benthanger depending from the main truck frame intermediate the wheeledtruck frames adapted to carry a load suspended beneath the truck, and aconnection between said hanger and the main truck frame which willpermit both 45 vertical oscillatory movement and horizontal pivotalmovement between the said hanger and said main truck frame.

4. In a monorail truck, a main truck frame, a pair of wheeled truckssupporting said main truck 50 frame and connected to the end portions ofthe latter, a pair of aligned wheels on each of said wheeled truckframes adapted to traverse a single rail track, a connection betweeneach of the wheeled trucks and the main truck frame adapted 55 to permitboth vertical oscillatory movement and horizontal pivotal movement ofthe wheeled truck frames relative to the main truck frame, a hangerdepending from the main truck frame intermediate of the wheeled truckframes adapted to 60 carry a load suspended beneath the truck, and aconnection between said hanger and the main truck frame which willpermit both vertical oscillatory and horizontal pivotal movement betweensaid hanger and said main truck frame; the ver- 65 tical oscillationbetween the main truck frame and the wheel truck frames being limited toa plane longitudinally of the wheel truck frame and the verticaloscillation between the hanger and the main truck frame being limited toa plane 70 longitudinally of the main truck frame.

5. In a monorail truck, a main truck frame, a wheeled truck framesupporting each end of said main truck frame, a pair of wheels on eachof said wheeled trucks arranged in alignment and 75 adapted to traversea single rail track, a bearing 7 plane above the axes of said wheels,and a bent hanger suspended from said main truck frame adapted to havevertical oscillatory movement and horizontal pivotal movement relativeto said frame, said hanger being connected to said frame at a pointintermediate said wheeled truck frames "and on a plane below the planeof the connection between the wheeled truck frames and the main truckframe.

6. In a monorail truck, a main truck frame, a wheeled truck framesupporting each end of said main truck frame, a pair of wheels on eachof said wheeled trucks arranged in alignment and adapted to traverse asingle rail track, a bearing connection between the wheeled truck framesand the main truck frameadapted to permit relative vertical wheeledtruck frame and the main truckframe, and also permit horizontal pivotalmovement between the wheeled truck frames and the main truck frame, saidbearing connection being located at a point on a plane intermediate saidwheels and on a plane above the axis of said wheels, and a bent hangersuspended from said main truck frame adapted to have verticaloscillatory movement and horizontal pivotal movement relative to saidframe, said hanger being connected to said frame at a point intermediatesaid wheeled truck frames and on a plane below the plane of theconnection between the wheeled truck frames and the main truck frame,the plane of said connection between the said hanger and the main truckframe being in alignment with the normal horizontal plane of the axes ofsaid wheels.

'7. In a monorail truck, a main truck frame, wheeled truck framessupporting the ends of said main truck frame, means for pivotallyconnecting said wheeled truck frames to said main truck frame, saidmeans comprising a substantially semi-spherical member seating in asocket in the wheeled truck frame for both horizontal and verticalturning movement in said socket, a king pin extending through saidmember and through an elongated slot in said socket, and a nut on thelower end of said pin arranged beneath the wall of said socket forsecuring said member within said socket.

8. In a monorail truck, a main truck frame, wheeled truck framessupporting the ends of said main truck frame, means for pivotallyconnecting said wheeled truck frames to said main truck frame, saidmeans comprising a substantially semi-spherical member seating in asocket in the wheeled truck frame, means for securing said member tosaid main truck frame and within said socket, said last named meansadapted to permit both vertical oscillatory movement and horizontalpivotal movement between said wheeled truck frames and the main truckframe, and a pair of tapered elements interposed between said framesadjacent opposite sides of said member to prevent vertical oscillatorymovement of said frames transversely thereof.

9. In a monorail truck; a main truck frame, wheeled truck framessupporting the ends of said main truck frame, means for pivotallyconnecting said wheeled truck frames to said main truck horizontaloscillatory movement between the frame, said means comprising asubstantially semi-spherical member seating in a socket in the wheeledtruck frame, means for securing said member to said main truck frame andwithin said socket, said last named means adapted to permit bothvertical oscillatory movement and pivotal movement between said wheeledtruck frames and the main truck frame, and means whereby the verticaloscillatory movement will be confined to a vertical plane extending in adirection of the length of the wheeled truck frame.

10, In a monorail truck, a main truck frame, a

wheeled truck frame, a socket member carried by the wheeled truck framehaving an elongated slot in the bottom wall of the socket, asubstantially semi-spherical member seated in said socket connected tothe main truck frame, said member being adapted for both horizontal andvertical turning movement in said socket, and a pin on said memberextending into the elongated slot.

11. In a monorail truck, a main truck frame, a wheeled truck frame, asocket member carried by the wheeled truck frame having an elongatedslot in the bottom wall of the socket, a substantially semi-sphericalmember seated in said socket connected to the main truck frame, a pin onsaid member extending into the elongated slot, and means engaging saidpin for securing said member within said socket adapted to permitvertical rocking movement of said member in said socket and also permitturning movement of said member in said socket around the axis of saidstem. V

12. In a monorail truck, a main truck frame, wheeled truck framessupporting said main truck frame and connected to the latter to haveboth vertical oscillatory and lateral swinging movement relativethereto, a bent hanger depending from said truck frame for suspending acar from said main truck frame, a semi-spherical member connected tosaid hanger seating in a socket in said main truck frame, said socketbeing disposed substantially on the plane of the axes of wheels on saidwheeled truck frames, and means for holding said member within saidsocket adapted to permit said member to have vertical oscillatorymovement and horizontal pivotal movement within said socket.

13. In a monorail transportation system, the

combination of an elevated single rail track, a

plurality of trucks adapted to traverse said track, a main truck frameembodied in each of said trucks, a plurality of wheeled truck framesadapted to traverse a single rail track and connected to each of saidmain truck frames to have vertical articulate movement and horizontalpivotal movement relative thereto, a hanger depending from each of saidmain truck frames connected thereto above said track for both verticaloscillatory movement and horizontal turning movement, and a car carriedby said hanger suspended beneath said track.

14. In a monorail transportation system, the combination of an elevatedsingle rail track, a plurality of trucks adapted to traverse said track,a main truck frame embodied in each of said trucks, a plurality ofwheeled truck frames adapt ed to traverse a single rail track andconnected to each of said main truck frames to have vertical articulatemovement and horizontal pivotal movement relativethereto, a hangersuspended from each of said main truck frames connected thereto for bothvertical oscillatory movement and horizontal turning movement, and a carcar- 75 limited to a plane longitudinally-of the wheel truck frame andthe Vertical oscillation between the hanger and the main truck framebeing limited. to a plane longitudinally of the main truck frame.

15. In a monorail truck, an articulate joint comprising a pair ofsuperimposed members the lowermost of which is formed with a sockethaving an elongated slot opening through the bot- 'tom wall thereof, asemi-spherical bearing member seated in said socket affixed to theunderside 6 2;0'2o,5 io ried by said" hangers suspended beneath saidtrack; the Vertical oscillation between the main truck frame and thewheel truck frames being of the uppermost of said members, a pin carriedby said uppermost member projecting downwardpin and slot to preventoscillation of said spheri- 10 cal member in a direction transversely ofsaid slot. Q; v

DE CLERMONT DUNLAP.

